Tags, faceplates and reusable objects
Цель: Изучить тему «Tags, faceplates and reusable objects» и закрепить её практическими заданиями и самопроверкой.
2 акад. часа чтение и разбор теории, решение задач, работа со схемой или виртуальным стендом и проверка понимания.
Основной материал
HMI tag references PLC/DCS variable. A motor faceplate shows command, run feedback, fault, mode, permissives, runtime and diagnostics. Reusable faceplates ensure consistency across hundreds of devices.
Command security
Writing command from HMI should include user permission, mode checks and controller-side interlocks. Never rely only on disabling screen button; PLC must enforce safety/permissive logic.
Практическая работа
Define faceplate data model for control valve and for motor. Include PV? position, command, mode, alarms, maintenance data.
Самопроверка
• What is HMI tag?
• What is faceplate?
• Why reuse objects?
• Where interlock must be enforced?
• What user permissions needed?
Что нужно запомнить
- A motor faceplate shows command, run feedback, fault, mode, permissives, runtime and diagnostics.
- Reusable faceplates ensure consistency across hundreds of devices.
- Writing command from HMI should include user permission, mode checks and controller-side interlocks.
- Never rely only on disabling screen button; PLC must enforce safety/permissive logic.
- Define faceplate data model for control valve and for motor.